CN212927979U - Test bench for testing catalytic activity of SCR catalyst - Google Patents

Test bench for testing catalytic activity of SCR catalyst Download PDF

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Publication number
CN212927979U
CN212927979U CN202021854707.6U CN202021854707U CN212927979U CN 212927979 U CN212927979 U CN 212927979U CN 202021854707 U CN202021854707 U CN 202021854707U CN 212927979 U CN212927979 U CN 212927979U
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air inlet
catalyst
primary
reduction catalyst
exhaust end
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苏兵
袁德文
汪亮亮
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Guangdong Green Valley Environmental Protection Technology Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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Abstract

The utility model relates to a tail gas treatment technical field discloses a test bench for testing catalytic activity of SCR catalyst, include: the air inlet end of the air inlet pipe is communicated with the exhaust end of the internal combustion engine, and an ammonia water atomizing nozzle is arranged in the air inlet pipe; the air inlet end of the oxidation catalyst is communicated with the air outlet end of the air inlet pipe and is used for catalytically oxidizing the tail gas of the internal combustion engine; the primary reduction catalytic device is communicated with the exhaust end of the oxidation catalytic device and can promote the reaction of the tail gas of the internal combustion engine and the introduced reducing agent, and the primary reduction catalytic device can detect the concentration of nitrogen oxides at the air inlet end and the exhaust end; and the air inlet end of the secondary reduction catalytic device is communicated with the exhaust end of the primary reduction catalytic device, so that the reaction of the tail gas of the internal combustion engine and the introduced reducing agent can be promoted, and the concentration of the nitrogen oxide at the exhaust end can be detected by the secondary reduction catalytic device. The utility model provides a test rack can test SCR catalyst's catalytic activity and denitration efficiency under different operating modes, emission concentration safely and reliably in succession.

Description

Test bench for testing catalytic activity of SCR catalyst
Technical Field
The utility model relates to a tail gas treatment technical field especially relates to a test rack for testing catalytic activity of SCR catalyst.
Background
Internal combustion engines, when operating, react with nitrogen and oxygen in the air to form a variety of compounds in the cylinder, and nitrogen oxides can cause a variety of environmental and health problems over a wide range.
The concentration of nitrogen oxides in the tail gas of the internal combustion engine is far higher than the emission requirement, and in the existing wet denitration, the reaction of a liquid absorption method is fast, the purification effect is good, but the total absorption efficiency is not high, and the purification requirement cannot be met.
The Selective Catalytic Reduction (SCR) denitration technology is the main method for denitration of flue gas at present, and the method is that a reducing agent selectively reacts with nitric oxide in the flue gas under the action of a catalyst to generate N2And O2. The key technology of the medium-high temperature SCR catalytic method is a medium-high temperature SCR catalyst, how to test the high-temperature catalytic activity is an important problem in the research of the medium-high temperature SCR catalyst at present, and when the existing test bed frame is used for simulating nitrogen oxide gases with different concentrations, ammonia gas is directly injected into a pipeline, so that test gas leakage is easily caused, and the test gas is not easy to store.
Therefore, a test bench for testing the catalytic activity of the SCR catalyst is needed to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
Based on above, an object of the utility model is to provide a test rack for testing catalytic activity of SCR catalyst, catalytic activity and denitration efficiency of SCR catalyst under can safe and reliable nature continuous test different operating modes, emission concentration.
In order to achieve the purpose, the utility model adopts the following technical proposal:
there is provided a test rig for testing catalytic activity of an SCR catalyst mounted on an exhaust end of an internal combustion engine, comprising:
the air inlet end of the air inlet pipe is communicated with the exhaust end of the internal combustion engine, and an ammonia water atomizing nozzle is arranged in the air inlet pipe;
an oxidation catalyst, an intake end of which is communicated with an exhaust end of the intake pipe, for catalytically oxidizing exhaust gas of the internal combustion engine;
the primary reduction catalytic device is provided with a catalyst inside and can promote the reaction of the tail gas of the internal combustion engine and an introduced reducing agent, and the primary reduction catalytic device can respectively detect the concentration of nitrogen oxides at the gas inlet end and the gas outlet end; and
and the air inlet end of the secondary reduction catalytic device is communicated with the exhaust end of the primary reduction catalytic device, a catalyst is arranged in the secondary reduction catalytic device, the reaction of the tail gas of the internal combustion engine and the introduced reducing agent can be promoted, and the concentration of the nitrogen oxide at the exhaust end of the secondary reduction catalytic device can be detected.
As an alternative to the test rig, the primary reduction catalyst device comprises:
the air inlet end of the primary mixing pipe is communicated with the exhaust end of the oxidation catalyst, a first atomizing nozzle is arranged in the primary mixing pipe, and the first atomizing nozzle can spray atomized reducing agent into the primary mixing pipe; and
and the gas inlet end of the first-stage reduction catalyst is communicated with the gas outlet end of the first-stage mixing pipe, and a catalyst is arranged in the first-stage reduction catalyst and can promote the reaction of the tail gas and the reducing agent.
As an alternative to the test bench, the primary reduction catalyst device further comprises:
the first nitrogen-oxygen sensor is arranged at the air inlet end of the primary mixing pipe; and
and the second nitrogen oxide sensor is arranged at the exhaust end of the primary reduction catalyst.
As an optional solution of the test bench, an air pressure sensor is disposed in the primary mixing tube for detecting the air pressure inside the test bench.
As an alternative to the test bench, the primary reduction catalyst device further comprises:
the first temperature sensor is arranged at the air inlet end of the primary reduction catalyst; and
and the second temperature sensor is arranged at the exhaust end of the primary reduction catalyst.
As an alternative to the test rig, the secondary reduction catalyst device comprises:
the air inlet end of the second-stage mixing pipe is communicated with the exhaust end of the first-stage reduction catalytic device, a second atomizing nozzle is arranged in the second-stage mixing pipe, and the second atomizing nozzle can spray atomized reducing agent into the second-stage mixing pipe; and
and the air inlet end of the secondary reduction catalyst is communicated with the exhaust end of the secondary mixing pipe, and a catalyst is arranged in the secondary reduction catalyst and can promote the reaction of the tail gas and the reducing agent.
As an alternative to the test rig, the secondary reduction catalyst device further comprises:
and the third nitrogen-oxygen sensor is arranged at the exhaust end of the secondary reduction catalyst.
As an alternative to the test rig, the secondary reduction catalyst device further comprises:
and the third temperature sensor is arranged at the exhaust end of the secondary reduction catalyst.
As an optional scheme of the test bench, an ammonia gas concentration sensor is arranged at the exhaust end of the oxidation catalyst or the air inlet end of the primary reduction catalyst device and is used for detecting the ammonia gas concentration.
As an alternative to the test bench, a fourth nox sensor is provided at the intake end of the intake pipe for detecting the initial nox concentration in the exhaust gas of the internal combustion engine.
The utility model has the advantages that:
the utility model provides a test rack for testing catalytic activity of SCR catalyst passes through the intake pipe to be connected with the exhaust end of internal-combustion engine, according to test concentration demand, in the intake pipeThe ammonia water atomizing nozzle sprays a certain amount of ammonia water into the pipe to mix the ammonia water with the tail gas of the internal combustion engine, then the tail gas is oxidized by the oxidation catalyst, and CO, HC and NO in the tail gas are catalytically oxidized into harmless CO under the action of the catalyst2、H2O and NO2Then the tail gas flows through a first-stage reduction catalytic device and a second-stage reduction catalytic device in sequence, the concentration of the nitrogen oxides measured by the air inlet end of the first-stage reduction catalytic device is equal to the concentration required by the test, the first-stage reduction catalytic device carries out first-stage reduction denitration on the tail gas through a reducing agent, the difference value of the concentrations of the nitrogen oxides respectively measured by the air outlet end and the air inlet end of the first-stage reduction catalytic device is compared, the catalytic activity of the SCR catalyst under corresponding conditions can be obtained, the secondary reduction catalytic device adjusts the flow of the introduced reducing agent according to the concentration of the nitrogen oxide measured at the exhaust end of the primary reduction catalytic device, so that the concentration of nitrogen oxide at the exhaust end of the test bench reaches below the emission standard, the problem that the tail gas discharged by the test bench is not thoroughly denitrated to cause leakage pollution is avoided, the catalytic activity and denitration efficiency of the SCR catalyst under different working conditions and emission concentrations are safely and reliably tested continuously.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a schematic layout of a testing bench for testing catalytic activity of an SCR catalyst according to the present invention.
In the figure:
100. an internal combustion engine;
1. an air inlet pipe; 11. an ammonia water atomization nozzle; 12. a fourth nitrogen-oxygen sensor; 2. an oxidation catalyst; 31. a first-stage mixing pipe; 311. a first atomizer; 32. a primary reduction catalyst; 33. a first nitrogen-oxygen sensor; 34. a second nitrogen oxide sensor; 35. an air pressure sensor; 36. an ammonia gas concentration sensor; 37. a first temperature sensor; 38. a second temperature sensor; 39. a first flow meter; 41. a secondary mixing pipe; 411. a second atomizer; 42. a secondary reduction catalyst; 43. a third nitrogen-oxygen sensor; 44. a third temperature sensor; 5. and (4) exhausting the gas.
Detailed Description
In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, the present embodiment provides a test bench for testing catalytic activity of an SCR catalyst, which is installed on an exhaust end of an internal combustion engine 100, and includes an intake pipe 1, an oxidation catalyst 2, a primary reduction catalyst device, a secondary reduction catalyst device, and an exhaust pipe 5. Wherein, the air inlet end of the air inlet pipe 1 is communicated with the exhaust end of the internal combustion engine 100, an ammonia water atomization nozzle 11 is arranged in the air inlet end, the air inlet end of the oxidation catalyst 2 is communicated with the exhaust end of the air inlet pipe 1 and is used for catalytically oxidizing the tail gas of the internal combustion engine 100, the air inlet end of the first-stage reduction catalyst device is communicated with the exhaust end of the oxidation catalyst 2, a catalyst is arranged in the catalyst and can promote the tail gas of the internal combustion engine 100 to react with the introduced reducing agent, the first-stage reduction catalyst device can respectively detect the nitrogen oxide concentration of the air inlet end and the exhaust end, the air inlet end of the second-stage reduction catalyst device is communicated with the exhaust end of the first-stage reduction catalyst device, a catalyst is arranged in the catalyst and can promote the tail gas of the internal combustion engine 100 to react with the introduced reducing agent, the second-stage reduction, the other end of the exhaust pipe 5 communicates with the atmosphere.
Specifically, the present embodiment provides forThe test bed frame is connected with the exhaust end of the internal combustion engine 100 through the air inlet pipe 1, according to the requirement of test concentration, the ammonia water atomizing nozzle 11 in the air inlet pipe 1 sprays a certain amount of ammonia water into the pipe to be mixed with the tail gas of the internal combustion engine 100, then the tail gas is oxidized through the oxidation catalyst 2, and CO, HC and NO in the tail gas are catalytically oxidized into harmless CO under the action of the catalyst2、H2O and NO2Then the tail gas flows through a first-stage reduction catalytic device and a second-stage reduction catalytic device in sequence, the concentration of the nitrogen oxides measured by the air inlet end of the first-stage reduction catalytic device is equal to the concentration required by the test, the first-stage reduction catalytic device carries out first-stage reduction denitration on the tail gas through a reducing agent, the difference value of the concentrations of the nitrogen oxides respectively measured by the air outlet end and the air inlet end of the first-stage reduction catalytic device is compared, the catalytic activity of the SCR catalyst under corresponding conditions can be obtained, the secondary reduction catalytic device adjusts the flow of the introduced reducing agent according to the concentration of the nitrogen oxide measured at the exhaust end of the primary reduction catalytic device, so that the concentration of nitrogen oxide at the exhaust end of the test bench reaches below the emission standard, the problem that the tail gas discharged by the test bench is not thoroughly denitrated to cause leakage pollution is avoided, the catalytic activity and denitration efficiency of the SCR catalyst under different working conditions and emission concentrations are safely and reliably tested continuously.
Optionally, the first-stage reduction catalytic device comprises a first-stage mixing pipe 31 and a first-stage reduction catalytic device 32, an air inlet end of the first-stage mixing pipe 31 is communicated with an exhaust end of the oxidation catalytic device 2, a first atomizer 311 is arranged in the first-stage mixing pipe, the first atomizer 311 can spray atomized reducing agent into the first-stage mixing pipe 31, an air inlet end of the first-stage reduction catalytic device 32 is communicated with an exhaust end of the first-stage mixing pipe 31, a catalyst is arranged in the first-stage reduction catalytic device 32, and reaction of tail gas and the reducing agent can be promoted. Specifically, the oxidized tail gas enters the primary mixing pipe 31, is mixed with the reducing agent sprayed by the first atomizer 311, and then flows into the primary reduction catalyst together, so that the denitration reduction reaction occurs under the action of the catalyst.
Further, the primary reduction catalyst device further includes a first nitrogen-oxygen sensor 33 and a second nitrogen-oxygen sensor 34, wherein the first nitrogen-oxygen sensor 33 is disposed at an intake end of the primary mixing pipe 31, and the second nitrogen-oxygen sensor 34 is disposed at an exhaust end of the primary reduction catalyst 32. The first nitrogen-oxygen sensor 33 and the second nitrogen-oxygen sensor 34 measure the nitrogen oxide concentration of the exhaust gas before and after the action of the primary reduction catalyst device, and calculate the catalytic activity and denitration efficiency of the SCR catalyst in the primary reduction catalyst 32 according to the difference between the two concentration values.
Optionally, the first-stage reduction catalyst device further includes a first temperature sensor 37 and a second temperature sensor 38, the first temperature sensor 37 is disposed at an air inlet end of the first-stage reduction catalyst 32, and the second temperature sensor 38 is disposed at an exhaust end of the first-stage reduction catalyst 32. Specifically, the reaction temperature is one of the important factors affecting the catalytic activity of the SCR catalyst, and therefore, the detection and control of the reaction temperature are particularly important, and the gas temperatures at the intake end and the exhaust end of the primary reduction catalyst 32 are measured by the first temperature sensor 37 and the second temperature sensor 38, respectively, and the average value of the two is used as the actual temperature value in the primary reduction catalyst 32.
Optionally, the test bench further includes an air pressure sensor 35, and the air pressure sensor 35 is disposed in the first-stage mixing pipe 31 and is configured to detect an air pressure in the test bench, so as to prevent an excessive air pressure in the test bench and protect the stable operation of the internal combustion engine 100.
Optionally, a first flowmeter 39 is disposed in the primary mixing pipe 31 and is configured to detect, in real time, a flow rate of the reducing agent sprayed by the first atomizer 311 in the primary mixing pipe 31. On the one hand, the first flow meter 39 can detect whether the first atomizer 311 is in an operating state; on the other hand, the first flow meter 39 can detect whether the flow amount of the reducing agent sprayed by the first atomizer 311 is within a preset range.
Optionally, the second-stage reduction catalytic device includes a second-stage mixing tube 41 and a second-stage reduction catalytic device 42, an air inlet end of the second-stage mixing tube 41 is communicated with an exhaust end of the oxidation catalytic device 2, a second atomizer 411 is arranged in the second-stage mixing tube, the second atomizer 411 can spray atomized reducing agent into the second-stage mixing tube 41, an air inlet end of the second-stage reduction catalytic device 42 is communicated with an exhaust end of the second-stage mixing tube 41, and a catalyst is arranged in the second-stage reduction catalytic device 42, so that reaction of tail gas and the reducing agent can be promoted. Specifically, the tail gas passing through the primary reduction catalyst device enters the secondary mixing pipe 41, is mixed with the reducing agent sprayed by the second atomizer 411, and then flows into the secondary reduction catalyst together, so that the denitration reduction reaction occurs under the action of the catalyst.
Optionally, the secondary reduction catalyst device further includes a third nox sensor 43, and the third nox sensor 43 is disposed at an exhaust end of the secondary reduction catalyst 42. Specifically, in order to avoid the leakage of nitrogen oxides in the exhaust gas and ensure that the finally discharged exhaust gas reaches the emission standard, the second atomizer 411 measures the concentration of the nitrogen oxides according to the second nitrogen oxide sensor 34, preliminarily sets the flow rate of the sprayed reducing agent, measures the concentration of the nitrogen oxides according to the third nitrogen oxide sensor 43, appropriately corrects and adjusts the flow rate of the sprayed reducing agent, and forms feedback regulation, so that the finally discharged exhaust gas reaches the emission standard.
Optionally, the secondary reduction catalyst device further comprises a third temperature sensor 44, and the third temperature sensor 44 is disposed at the exhaust end of the secondary reduction catalyst 42 and is used for measuring the temperature of the exhaust gas discharged by the test bench.
Optionally, a second flowmeter is disposed in the second-stage mixing pipe 41, and is configured to detect, in real time, a flow rate of the reducing agent sprayed by the second atomizer 411 in the second-stage mixing pipe 41. On one hand, the second flow meter can detect whether the second atomizer 411 is in a working state; on the other hand, the second flow meter can detect whether the flow quantity of the reducing agent sprayed by the second atomizer 411 is within a preset range.
Optionally, an ammonia gas concentration sensor 36 is disposed at the exhaust end of the oxidation catalyst 2 or the air inlet end of the primary reduction catalyst device, and is configured to detect the ammonia gas concentration. Specifically, when the ammonia concentration measured by the ammonia concentration sensor 36 exceeds a preset value, the flow rate of the ammonia sprayed by the ammonia atomizing nozzle 11 is adjusted downward; when the concentration of the nitrogen oxides measured by the first nitrogen-oxygen sensor 33 exceeds a preset value, the flow of the ammonia water sprayed by the ammonia water atomizer 11 is adjusted upwards. In addition, a fourth nox sensor 12 is provided at the intake end of the intake pipe 1, and the fourth nox sensor 12 is used to detect the initial nox concentration in the exhaust gas of the internal combustion engine 100.
Optionally, the air inlet pipe 1, the oxidation catalyst 2, the first-stage mixing pipe 31, the first-stage reduction catalyst 32, the second-stage mixing pipe 41, the second-stage reduction catalyst 42 and the exhaust pipe 5 in the test bench are all made of stainless steel, copper alloy or aluminum alloy, so that the test bench has good corrosion resistance and the service life of the test bench is prolonged.
Optionally, the reducing agent is ammonia or urea. Specifically, the reducing agent is stored in the storage barrel, the storage barrel is communicated with the first atomizing nozzle 311 and the second atomizing nozzle 411 through pipelines, and the pipelines are provided with electronic valves which can automatically adjust the opening and closing of the valves and the opening size, so that the flow of the reducing agent sprayed out by the first atomizing nozzle 311 and the second atomizing nozzle 411 is controlled.
Optionally, the test bench further includes a central control module, the central control module is composed of a single chip microcomputer and a programmable logic controller, the central control module is electrically connected with the electronic valve and each of the sensors and the flow meters, and the central control module can load and execute a control program to control the electronic valve electrically connected with the central control module and each of the sensors and the flow meters to implement their respective functions.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims (10)

1. A test bench for testing the catalytic activity of an SCR catalyst, mounted on the exhaust end of an internal combustion engine (100), characterized by comprising:
the air inlet end of the air inlet pipe (1) is communicated with the exhaust end of the internal combustion engine (100), and an ammonia water atomizing nozzle (11) is arranged in the air inlet pipe;
an oxidation catalyst (2) having an intake end communicating with an exhaust end of the intake pipe (1) for catalytically oxidizing exhaust gas of the internal combustion engine (100);
the air inlet end of the first-stage reduction catalytic device is communicated with the exhaust end of the oxidation catalytic device (2), a catalyst is arranged in the first-stage reduction catalytic device, the reaction of tail gas of the internal combustion engine (100) and introduced reducing agents can be promoted, and the concentration of nitrogen oxides at the air inlet end and the concentration of nitrogen oxides at the exhaust end of the first-stage reduction catalytic device can be respectively detected; and
and the air inlet end of the secondary reduction catalytic device is communicated with the exhaust end of the primary reduction catalytic device, a catalyst is arranged in the secondary reduction catalytic device, the reaction of the tail gas of the internal combustion engine (100) and the introduced reducing agent can be promoted, and the concentration of nitrogen oxide at the exhaust end of the secondary reduction catalytic device can be detected.
2. The test rack of claim 1, wherein the primary reduction catalyst device comprises:
the air inlet end of the primary mixing pipe (31) is communicated with the air outlet end of the oxidation catalyst (2), a first atomizing nozzle (311) is arranged in the primary mixing pipe, and the first atomizing nozzle (311) can spray atomized reducing agent into the primary mixing pipe (31); and
the gas inlet end of the first-stage reduction catalyst (32) is communicated with the gas outlet end of the first-stage mixing pipe (31), and a catalyst is arranged in the first-stage reduction catalyst (32) and can promote the reaction of tail gas and a reducing agent.
3. The test rack of claim 2, wherein the primary reduction catalyst device further comprises:
the first nitrogen-oxygen sensor (33) is arranged at the gas inlet end of the primary mixing pipe (31); and
and the second nitrogen oxide sensor (34) is arranged at the exhaust end of the primary reduction catalyst (32).
4. Test bench according to claim 2, characterized in that an air pressure sensor (35) is arranged in the primary mixing tube (31) for detecting the air pressure level inside the test bench.
5. The test rack of claim 2, wherein the primary reduction catalyst device further comprises:
a first temperature sensor (37) arranged at the air inlet end of the primary reduction catalyst (32); and
and a second temperature sensor (38) arranged at the exhaust end of the primary reduction catalyst (32).
6. The test rack of claim 1, wherein the secondary reduction catalyst device comprises:
the air inlet end of the secondary mixing pipe (41) is communicated with the exhaust end of the primary reduction catalytic device, a second atomizing nozzle (411) is arranged in the secondary mixing pipe, and the second atomizing nozzle (411) can spray atomized reducing agent into the secondary mixing pipe (41); and
and the air inlet end of the secondary reduction catalyst (42) is communicated with the air outlet end of the secondary mixing pipe (41), and a catalyst is arranged in the secondary reduction catalyst (42) and can promote the reaction of the tail gas and the reducing agent.
7. The test rack of claim 6, wherein the secondary reduction catalyst device further comprises:
and the third nitrogen-oxygen sensor (43) is arranged at the exhaust end of the secondary reduction catalyst (42).
8. The test rack of claim 6, wherein the secondary reduction catalyst device further comprises:
and the third temperature sensor (44) is arranged at the exhaust end of the secondary reduction catalyst (42).
9. Test bench according to one of claims 1 to 8, characterized in that the exhaust end of the oxidation catalyst (2) or the inlet end of the primary reduction catalyst device is provided with an ammonia concentration sensor (36) for detecting the ammonia concentration.
10. Test bench according to one of claims 1 to 8, characterized in that a fourth nox sensor (12) is provided on the intake end of the intake pipe (1) for detecting the initial nox concentration in the exhaust gases of the internal combustion engine (100).
CN202021854707.6U 2020-08-28 2020-08-28 Test bench for testing catalytic activity of SCR catalyst Active CN212927979U (en)

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